We have lived in HN for ten years now.

• It is ten years since we moved to HN.

My students learnt a lot of interesting experience from this man last week.

• My students have learnt a lot of interesting experiences from this man.

She has never seen a dirtier-looking dog before.

• This is the first time she has seen a dirtier-looking dog.

When did your brother move to Iraq?

• How long has your brother been in Iraq?
• How long is it since your brother moved to Iraq?

I haven't seen my son for ages.

• It is ages since I saw my son.
• The last time I saw my son was ages ago.

Tom hasn't been to HN before.

• This is the first time Tom has been to HN.

My sister started to work for an enterprise when she graduated from university.

• My sister has worked for an enterprise since she graduated from university.

I have lived in Hoi An since June 4th, 2001.

• I moved to Hoi An on June 4th, 2001.

The last time I went to HN was in May.

• I haven't been to HN since May.

I have not been there for a long time.

• The last time I was there was a long time ago.

He hasn't visited me since May.

• The last time he visited me was in May.

No one has challenged his authority before.

• This is the first time his authority has been challenged.

Since I was in this city, I have not seen him.

• I last saw him when I was in this city.

It became more and more difficult to get into university in 1999.

• It has been becoming more and more difficult to get into university since 1999.

The car industry in England has developed for many years now.

• It has been many years since the car industry in England started developing.

How long is it since Kate last replied your email?

• When did Kate last reply to your email?